通常所见的螺旋弹簧灯丝的横断面投影形态为圆形，此外还有扁圆以及用一大一小两根芯线并拢绕成的梨形，本文介绍的是一种结构新颖的灯丝，其断面投影呈多角形，外围可见有若干圆弧形顶角，呈回转螺旋形分布（见图１），这就是角形回转螺旋弹簧灯丝（以下简称多角灯丝）。... Commonly seen helical spring filament cross-sectional projection of a circular shape, in addition to oblate and with a small one two small core and wound into a pear-shaped, this article describes a novel structure of the filament, which Section projection was polygonal, the periphery can be seen there are a number of arc-shaped vertex, was rotary spiral distribution (see Figure 1), which is angular rotary coil spring filament (hereinafter referred to as the polygonal filament). ...